Agilent X-Series Signal Generators SCPI Command Reference 35
Basic Function Commands
Digital Modulation Subsystem—N5172B/82B ([:SOURce])
:DM:IQADjustment:QOFFset
Supported N5172B/82B
[:SOURce]:DM:IQADjustment:QOFFset
[:SOURce]:DM:IQADjustment:QOFFset?
This command adjusts the Q channel offset value.
When using this command to minimize the LO feedthrough signal, optimum performance is achieved
when the command is sent after all other I/Q path commands are executed, such as those that
change the internal phase polarity or adjust the modulator attenuator. If other adjustments are made
after minimizing is performed, the LO feedthrough signal may increase.
The variable <value> is expressed in units of percent with a minimum resolution of 0.025.
*RST +0.00000000E+000
Range ï€20.000 to 20.000
Key Entry Q Offset
Remarks This command is effective only if the state of the I/Q adjustment function is set to
on. Refer to the :DM:IQADjustment[:STATe] command.
:DM:IQADjustment:QSKew
Supported N5172B/82B
[:SOURce]:DM:IQADjustment:QSKew <value>
[:SOURce]:DM:IQADjustment:QSKew?
This command adjusts the phase angle (quadrature skew) between the I and Q vectors by increasing
or decreasing the Q phase angle.
The <value> variable is expressed in degrees with a minimum resolution of 0.1.
If the signal generator is operating at frequencies greater than 3.3 GHz, quadrature skew settings
greater than ±5 degrees will not be within specifications.
Positive skew increases the angle from 90 degrees while negative skew decreases the angle from
90 degrees. When the quadrature skew is zero, the phase angle between the I and Q vectors is 90
degrees.
This command is effective only if the state of the I/Q adjustment function is set to ON. Refer to the
:DM:IQADjustment[:STATe] command.
Example
:DM:IQAD:QSK 4.5
The preceding example increases the phase angle by 4.5 degrees.
*RST +0.00000000E+000
Range ï€1E1 to +1E1
Key Entry Quadrature Angle Adjustment
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